## While studying the dependence of potential difference (V) across a resistor on the current (I) passing through it, in order to determine the resistance of the resistor, a student took 5 readings for different values of current and plotted a graph between V and I. He got a straight line graph passing through the origin. What does the straight line signify? Write the method of determining resistance of the resistor using this graph.

**
Answer:
**

The graph between V and I is a straight line graph which passes through the origin.

The straight line signifies that
**
potential difference (V)
**
is
**
directly proportional
**
to
**
Current (I).
**

The
**
slope
**
of the straight line gives the
**
resistance
**
of the resistor.

**
Resistance or Slope = ( V
**
_{
2
}
**
- V
**
_{
1
}
**
) / ( I
**
_{
2
}
**
- I
**
_{
1
}
**
)
**

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